(2003•台湾)正方体的体积为2100立方公分,边长为a公分;正方形的面积为240平方公分,边长为b公分.请利用下表判断下列叙述何者正确( )
A.a<7
B.b<7
C.a>15
D.b>15
0 168770 168778 168784 168788 168794 168796 168800 168806 168808 168814 168820 168824 168826 168830 168836 168838 168844 168848 168850 168854 168856 168860 168862 168864 168865 168866 168868 168869 168870 168872 168874 168878 168880 168884 168886 168890 168896 168898 168904 168908 168910 168914 168920 168926 168928 168934 168938 168940 168946 168950 168956 168964 366461
| N | N3 | ||
| 21 22 23 24 25 | 4.582576 4.690416 4.795832 4.898979 5.000000 | 14.49138 14.83240 15.16575 15.49193 15.81139 | 9261 10648 12167 13824 15625 |
| N | | | |
| 21 22 23 24 25 | 2.758924 2.802039 2.843867 2.884499 2.924018 | 5.943922 6.036811 6.126926 6.214465 6.299605 | 12.80579 13.00591 13.20006 13.38866 13.57209 |
A.a<7
B.b<7
C.a>15
D.b>15